Riddle: Column Difference Decoder


Column Difference DecoderOnline version Two-digit subtraction riddles by Hidden Author 1 I am the difference when 12 is subtracted from 35. What number am I? Hints 1 What is 35 minus 12? 2 Think in tens and ones. 3 Subtract the smaller from the larger. 2 I am the difference when 23 is subtracted from 46. What number am I? Hints 1 46 minus 23 equals ? 2 Remember to borrow if needed. 3 Subtract the ones place first, then tens. 3 I am the difference when 21 is subtracted from 54. What number am I? Hints 1 What is 54 minus 21? 2 Then subtract the remaining 1 and 4. 3 Subtract 20 from 50 as a start. 4 I am the difference when 30 is subtracted from 62. What number am I? Hints 1 Answer lies in tens and ones. 2 Compute by tens: 6 tens minus 3 tens. 3 62 minus 30 is the same as 62 minus 30. 5 I am the difference when 13 is subtracted from 34. What number am I? Hints 1 Check by regrouping: 34-10=24, then -3=21. 2 Subtract ones first, then tens. 3 34 minus 13 equals 21. 6 I am the difference when 25 is subtracted from 46. What number am I? Hints 1 Alternatively, 46-25 = 21. 2 Subtract 20 to get 26, then minus 5 gives 21. 3 46 minus 25 is a simple mental subtract. 7 I am the difference when 14 is subtracted from 28. What number am I? Hints 1 What is 28-14? 2 Think of double 14. 3 28 minus 14 equals half of 28. 8 I am the difference when 10 is subtracted from 31. What number am I? Hints 1 Check: 31-10 = 21. 2 Subtract tens and ones separately if needed. 3 31 minus 10 equals 21. 9 In 54 − 21, what digit belongs in the ones place of the answer? Hints 1 Answer's ones digit is the result of 4−1. 2 Focus on the ones column: 4−1 = 3 (no borrow needed). 3 Compute the difference first: 54−21. 10 In 54 − 21, what digit belongs in the tens place of the answer? Hints 1 Tens digit is the same as the hundreds?Ignore that; just tens. 2 Then read the tens place of 33 as 3. 3 Compute the full difference 54−21=33.

1

I am the difference when 12 is subtracted from 35. What number am I?

Hints

1

What is 35 minus 12?

2

Think in tens and ones.

3

Subtract the smaller from the larger.

2

I am the difference when 23 is subtracted from 46. What number am I?

Hints

1

46 minus 23 equals ?

2

Remember to borrow if needed.

3

Subtract the ones place first, then tens.

3

I am the difference when 21 is subtracted from 54. What number am I?

Hints

1

What is 54 minus 21?

2

Then subtract the remaining 1 and 4.

3

Subtract 20 from 50 as a start.

4

I am the difference when 30 is subtracted from 62. What number am I?

Hints

1

Answer lies in tens and ones.

2

Compute by tens: 6 tens minus 3 tens.

3

62 minus 30 is the same as 62 minus 30.

5

I am the difference when 13 is subtracted from 34. What number am I?

Hints

1

Check by regrouping: 34-10=24, then -3=21.

2

Subtract ones first, then tens.

3

34 minus 13 equals 21.

6

I am the difference when 25 is subtracted from 46. What number am I?

Hints

1

Alternatively, 46-25 = 21.

2

Subtract 20 to get 26, then minus 5 gives 21.

3

46 minus 25 is a simple mental subtract.

7

I am the difference when 14 is subtracted from 28. What number am I?

Hints

1

What is 28-14?

2

Think of double 14.

3

28 minus 14 equals half of 28.

8

I am the difference when 10 is subtracted from 31. What number am I?

Hints

1

Check: 31-10 = 21.

2

Subtract tens and ones separately if needed.

3

31 minus 10 equals 21.

9

In 54 − 21, what digit belongs in the ones place of the answer?

Hints

1

Answer's ones digit is the result of 4−1.

2

Focus on the ones column: 4−1 = 3 (no borrow needed).

3

Compute the difference first: 54−21.

10

In 54 − 21, what digit belongs in the tens place of the answer?

Hints

1

Tens digit is the same as the hundreds?Ignore that; just tens.

2

Then read the tens place of 33 as 3.

3

Compute the full difference 54−21=33.

You can integrate the game into an LMS compatible with LTI 1.1 or LTI 1.3 such as Canvas, Moodle, or Blackboard. This way, the scores will be automatically saved into the platform’s gradebook.

Column Difference Decoder

Riddle

About this activity

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Download the paper version to play

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Column Difference DecoderOnline version

by Hidden Author

I am the difference when 12 is subtracted from 35. What number am I?

Hints

I am the difference when 23 is subtracted from 46. What number am I?

Hints

I am the difference when 21 is subtracted from 54. What number am I?

Hints

I am the difference when 30 is subtracted from 62. What number am I?

Hints

I am the difference when 13 is subtracted from 34. What number am I?

Hints

I am the difference when 25 is subtracted from 46. What number am I?

Hints

I am the difference when 14 is subtracted from 28. What number am I?

Hints

I am the difference when 10 is subtracted from 31. What number am I?

Hints

In 54 − 21, what digit belongs in the ones place of the answer?

Hints

In 54 − 21, what digit belongs in the tens place of the answer?

Hints

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